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A man with blood group A marries with a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits-blood group A or O is dominant ? Why or why not ?

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No, the information provided is not enough to tell whether blood group A or O is dominant.

Every character is controlled by a pair of alleles. And here it is not mentioned whether the man and woman were homozygous or heterozygous for their traits.

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